Equation 11 · Part 1 · Decoherence: The Quiet Selection That Makes the World Look Solid

Symbol t

t \sim 1/(\Lambda\, \Delta x^2)

t

What this part means

t is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

Its job in the formula

t is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

Full expressionSymbol tArticle meaning

The passage around this formula

Reading a decoherence time off this table only requires the exponent above: a superposition separated by $\Delta$ x decays with a characteristic time t $\sim$ 1/( $\Lambda$ \, $\Delta$ $x^2$ ) . Take the largest grain delocalized over roughly its own diameter, $\Delta$ x $\approx$ 10^{-3} centimetres, and the numbers in the first column turn into times measured in seconds only in the single, almost pathologically clean case of the cosmic background radiation…

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A variable is a named place for a value. Its letter is a local label: x can mean position in one formula and a data point in another.

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